UKAS accredited mass calibration service

We are a United Kingdom Accreditation Service United Kingdom Accreditation Service (UKAS) accredited calibration laboratory (No. 0338) for the calibration of mass.

Our ISO/IEC 17025 accreditation provides traceability to the SI system of units.

You can find more information in our full UKAS Schedule.

Type	Class	Material	Weight	Description
Precision Weights	OIML Class F1	Stainless Steel	1 mg to 25 kg	These classes of weights are typically used in precision engineering and pharmaceutical applications.
Test Weights	OIML Class F2	Stainless Steel, plated brass	1 mg to 25 kg	These class of weights are typically used by scale firms and businesses as the reference weights for checking the accuracy of weighing scales and platform scales used for industrial applications.
Test Weights	OIML Class M1	Brass, cast Iron, Aluminium.	1 mg to 25 kg	These class of weights are typically used by scale firms and businesses as the reference weights for checking the accuracy of weighing scales and platform scales used for industrial applications.

Calibration takes place in our laboratory where the environmental conditions are strictly controlled. Each item submitted for calibration is placed in the laboratory 24 hours prior to testing in order to acclimatise to these conditions. Once calibrated each item is returned with a fully traceable UKAS calibration certificate acceptable for most quality systems.

Traceability

The value of your weights will be determined by comparison through substitution weighing, with weights that can provide traceability to internationally recognised national standards. Traceability is vital for all measurement, it gives you confidence that the measurements you make are correct and will be consistent with those made in other places by other people.

Unique identification

For us to provide full traceability to your weights each weight needs to be uniquely identifiable. However labels and tags can interfere with the mass value. Weights are identified by marking with a permanent ink/paint or by stamping. Weights of higher accuracy have specific requirements, in these cases it is advised not to mark the weights and to mark the identity on the cases the weights are stored in.

Adjustment

We also offer a weight adjustment service for those weights that have fallen outside of the permitted tolerances as a result of wear and tear. This can be done on most weights for a small fee (information on current fees can be found at Calibration fee/charges).

Calibration frequency

During the period between calibrations, weights can gain or lose weight through wear and tear and damage from the environments they are used and stored in. To maintain our impartiality we cannot recommend the frequency you calibrate your weights. Customers usually determine their calibration period by either calculating a suitable period using data collected from a series of calibrations (drift) or by assigning an annual period in accordance with their own internal procedures.

Calibration Request Form

Trading Standards Service have created an online web-based form to replace the pdf version previously used. The new form requires an account to be created that is unique to Northern Ireland Trading Standards Service. This account will allow you to submit the request, leaving details on capacity for the required standard, the number and nominal quantity of weights, the option to request a statement of conformity and if weights require adjustment, along with requesting that the calibration date is inserted on the label and the ability to upload supporting documentation.

By creating an account and submitting a form online, each request will be assigned a unique reference number for you to track your request. You can then log back into your account at any point to submit additional requests, view the history of previous requests, leave addition messages and provide additional supporting documentation.

If you wish to request a Mass calibration, please submit a request form here:

• Mass Calibration request form

The submission of requests will not be available on bank and public holidays.

In order to provide an efficient and effective service we require all calibrations to be booked in at least 14 days in advance.

We will endeavour to complete calibration of your weights and have them ready for collection within 10 working days of being delivered. However, in some instances depending on the quantity and standard of weights, this may take longer.

We will always attempt to provide you with an accurate completion date during the booking-in process.

For terms and conditions for the calibration of weights, please see below:

Trading Standards Service Calibration Terms and Conditions

Contact

Department for the Economy
Trading Standards Service
176 Newtownbreda Road
Belfast
BT8 6QS

Telephone: 0300 123 62 62

For calibration services, email: calibration@economy-ni.gov.uk